D. N. Brown

*This is an algorithmically generated author record based on publicly available information.

Research Subjects

High Energy Physics

Research Interests

D. N. Brown has a total of 497 co-authors. Here are the top co-authors by number of shared publications:

A. Gaz
The Belle II Collaboration)
6 shared publications
A. Hafner
Babar Collaboration
6 shared publications
Aaron Roodman
Stanford University
6 shared publications
Abner Soffer
Tel Aviv University
6 shared publications
Abolhassan Jawahery
European Organization for Nuclear Research (CERN)
6 shared publications
Achim Denig
Johannes Gutenberg University of Mainz
6 shared publications

Latest Publications

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Open Access
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- 26 March 2026
- Published by American Physical Society (APS) in Physical Review D
Study of χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions in ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
Results are presented on χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions from e + e − → ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays. The data were collected with the detector at the PEP-II asymmetric-energy e + e − collider at SLAC. The integrated luminosity of the data sample is 28.0 fb − 1 , corresponding to 121.3 × 10 6 ϒ ( 3 S ) decays. Signals of χ b 1 , 2 ( 2 P ) are observed over a negligible background. Improved precision measurements of branching fractions are obtained. First measurements of the χ b 1 , 2 ( 2 P ) angular distributions are performed. No evidence is found for the presence of a χ b 0 ( 2 P ) → ω ϒ ( 1 S ) decay mode.
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- 26 March 2026
- Published by American Physical Society (APS) in Physical Review D
Open Access
Study of χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions in ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
Results are presented on χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions from e + e − → ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays. The data were collected with the detector at the PEP-II asymmetric-energy e + e − collider at SLAC. The integrated luminosity of the data sample is 28.0 fb − 1 , corresponding to 121.3 × 10 6 ϒ ( 3 S ) decays. Signals of χ b 1 , 2 ( 2 P ) are observed over a negligible background. Improved precision measurements of branching fractions are obtained. First measurements of the χ b 1 , 2 ( 2 P ) angular distributions are performed. No evidence is found for the presence of a χ b 0 ( 2 P ) → ω ϒ ( 1 S ) decay mode.
Open Access
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Cited by 3
- 10 February 2025
- Published by American Physical Society (APS) in Physical Review D
Search for baryogenesis and dark matter in B + → Λ c + + invisible decays
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
A mechanism of baryogenesis and dark matter production via B meson oscillations and decays has recently been proposed to explain the observed dark matter abundance and matter-antimatter asymmetry in the universe. This mechanism introduces a low-mass dark sector particle ( ψ D ) with a nonzero baryonic charge. We present a search for this new state in B + → Λ c + ψ D decays using data collected at the ϒ ( 4 S ) resonance by the detector at SLAC, corresponding to an integrated luminosity of 431.0 fb − 1 . The search leverages the full reconstruction of the B − meson in ϒ ( 4 S ) → B + B − decays, accompanied by the reconstruction of a Λ c + , to infer the presence of ψ D . No significant signal is observed, and limits on the B + → Λ c + ψ D branching fraction are set at the level of 1.6 × 10 − 4 at 90% confidence level for 0.94 < m ψ D < 2.99 GeV . These results set strong constraints on the parameter space allowed by B -meson baryogenesis.
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- 10 February 2025
- Published by American Physical Society (APS) in Physical Review D
Open Access
Search for baryogenesis and dark matter in B + → Λ c + + invisible decays
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
A mechanism of baryogenesis and dark matter production via B meson oscillations and decays has recently been proposed to explain the observed dark matter abundance and matter-antimatter asymmetry in the universe. This mechanism introduces a low-mass dark sector particle ( ψ D ) with a nonzero baryonic charge. We present a search for this new state in B + → Λ c + ψ D decays using data collected at the ϒ ( 4 S ) resonance by the detector at SLAC, corresponding to an integrated luminosity of 431.0 fb − 1 . The search leverages the full reconstruction of the B − meson in ϒ ( 4 S ) → B + B − decays, accompanied by the reconstruction of a Λ c + , to infer the presence of ψ D . No significant signal is observed, and limits on the B + → Λ c + ψ D branching fraction are set at the level of 1.6 × 10 − 4 at 90% confidence level for 0.94 < m ψ D < 2.99 GeV . These results set strong constraints on the parameter space allowed by B -meson baryogenesis.
Cited by 3
Open Access
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Cited by 12
- 20 August 2024
- Published by American Physical Society (APS) in Physical Review D
Model-independent extraction of form factors and $| V_{c b} |$ in $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ with hadronic tagging at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
Using the entire BABAR $ϒ (4 S)$ dataset, the first two-dimensional unbinned angular analysis of the semileptonic decay $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ is performed, employing hadronic reconstruction of the tag-side $B$ meson from $ϒ (4 S) \to B \bar{B}$ . Here, $ℓ$ denotes the light charged leptons $e$ and $μ$ . A novel data-driven signal-background separation procedure with minimal dependence on simulation is developed. This procedure preserves all multidimensional correlations present in the data. The expected $\sin^{2} θ_{ℓ}$ dependence of the differential decay rate in the Standard Model is demonstrated, where $θ_{ℓ}$ is the lepton helicity angle. Including input from the latest lattice QCD calculations and previously available experimental data, the underlying form factors are extracted using both model-independent (BGL) and dependent (CLN) methods. Comparisons with lattice calculations show flavor SU(3) symmetry to be a good approximation in the $B_{(s)} \to D_{(s)}$ sector. Using the BGL results, the CKM matrix element $| V_{c b} | = (41.09 \pm 1.16) \times 10^{- 3}$ and the Standard Model prediction of the lepton-flavor universality violation variable $R (D) = 0.300 \pm 0.004$ , are extracted. The value of $| V_{c b} |$ from $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ tends to be higher than that extracted using $\bar{B} \to D^{*} ℓ^{-} {\bar{ν}}_{ℓ}$ . The Standard Model $R (D)$ calculation is at a $1.97 σ$ tension with the latest HFLAV experimental average.
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- 20 August 2024
- Published by American Physical Society (APS) in Physical Review D
Open Access
Model-independent extraction of form factors and $| V_{c b} |$ in $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ with hadronic tagging at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
Using the entire BABAR $ϒ (4 S)$ dataset, the first two-dimensional unbinned angular analysis of the semileptonic decay $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ is performed, employing hadronic reconstruction of the tag-side $B$ meson from $ϒ (4 S) \to B \bar{B}$ . Here, $ℓ$ denotes the light charged leptons $e$ and $μ$ . A novel data-driven signal-background separation procedure with minimal dependence on simulation is developed. This procedure preserves all multidimensional correlations present in the data. The expected $\sin^{2} θ_{ℓ}$ dependence of the differential decay rate in the Standard Model is demonstrated, where $θ_{ℓ}$ is the lepton helicity angle. Including input from the latest lattice QCD calculations and previously available experimental data, the underlying form factors are extracted using both model-independent (BGL) and dependent (CLN) methods. Comparisons with lattice calculations show flavor SU(3) symmetry to be a good approximation in the $B_{(s)} \to D_{(s)}$ sector. Using the BGL results, the CKM matrix element $| V_{c b} | = (41.09 \pm 1.16) \times 10^{- 3}$ and the Standard Model prediction of the lepton-flavor universality violation variable $R (D) = 0.300 \pm 0.004$ , are extracted. The value of $| V_{c b} |$ from $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ tends to be higher than that extracted using $\bar{B} \to D^{*} ℓ^{-} {\bar{ν}}_{ℓ}$ . The Standard Model $R (D)$ calculation is at a $1.97 σ$ tension with the latest HFLAV experimental average.
Cited by 12
Open Access
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Cited by 35
- 21 December 2023
- Published by American Physical Society (APS) in Physical Review D
Measurement of additional radiation in the initial-state-radiation processes $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
A dedicated measurement of additional radiation in $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ initial-state-radiation events is presented using the full BABAR data sample. For the first time results are presented at next-to- and next-to-next-to-leading order, with one and two additional photons, respectively, for radiation from the initial and final states. Comparison with predictions from phokhara and afkqed Monte Carlo generators is performed, revealing discrepancies in the one-photon rates and angular distributions for the former. This disagreement has a negligible effect on the BABAR measurement of the $e^{+} e^{-} \to π^{+} π^{-} (γ)$ cross section, but could affect other measurements significantly. This study sheds a new light on the longstanding discrepancy in this channel that affects the theoretical prediction of hadronic vacuum polarization contributions to the muon magnetic moment anomaly.
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- 21 December 2023
- Published by American Physical Society (APS) in Physical Review D
Open Access
Measurement of additional radiation in the initial-state-radiation processes $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
A dedicated measurement of additional radiation in $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ initial-state-radiation events is presented using the full BABAR data sample. For the first time results are presented at next-to- and next-to-next-to-leading order, with one and two additional photons, respectively, for radiation from the initial and final states. Comparison with predictions from phokhara and afkqed Monte Carlo generators is performed, revealing discrepancies in the one-photon rates and angular distributions for the former. This disagreement has a negligible effect on the BABAR measurement of the $e^{+} e^{-} \to π^{+} π^{-} (γ)$ cross section, but could affect other measurements significantly. This study sheds a new light on the longstanding discrepancy in this channel that affects the theoretical prediction of hadronic vacuum polarization contributions to the muon magnetic moment anomaly.
Cited by 35
Open Access
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Google Scholar
Cited by 9
- 2 November 2023
- Published by American Physical Society (APS) in Physical Review D
Precision $e^{-}$ beam polarimetry at an $e^{+} e^{-}$ $B$ factory using tau-pair events
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
We present a new technique, “tau polarimetry,” for measuring the longitudinal beam polarization present in an $e^{+} e^{-}$ collider through the analysis of $e^{+} e^{-} \to τ^{+} τ^{-}$ events. By exploiting the sensitivity of $τ$ decay kinematics to the longitudinal polarization of the beams, we demonstrate that the longitudinal polarization can be measured with a 3 per mil systematic uncertainty at the interaction point using a technique that is independent of spin and beam transport modeling. Using $424.2 \pm 1.8 {fb}^{- 1}$ of BABAR data at $\sqrt{s} = 10.58 GeV$ , the average longitudinal polarization of the PEP-II $e^{+} e^{-}$ collider has been measured to be $⟨ P ⟩ = 0.0035 \pm 0.002 4_{stat} \pm 0.002 9_{sys}$ . The systematic uncertainty studies are described in detail, which can serve as a guide for future applications of tau polarimetry. A proposed $e^{-}$ beam longitudinal polarization upgrade to the SuperKEKB $e^{+} e^{-}$ collider would benefit from this technique.
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- 2 November 2023
- Published by American Physical Society (APS) in Physical Review D
Open Access
Precision $e^{-}$ beam polarimetry at an $e^{+} e^{-}$ $B$ factory using tau-pair events
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
We present a new technique, “tau polarimetry,” for measuring the longitudinal beam polarization present in an $e^{+} e^{-}$ collider through the analysis of $e^{+} e^{-} \to τ^{+} τ^{-}$ events. By exploiting the sensitivity of $τ$ decay kinematics to the longitudinal polarization of the beams, we demonstrate that the longitudinal polarization can be measured with a 3 per mil systematic uncertainty at the interaction point using a technique that is independent of spin and beam transport modeling. Using $424.2 \pm 1.8 {fb}^{- 1}$ of BABAR data at $\sqrt{s} = 10.58 GeV$ , the average longitudinal polarization of the PEP-II $e^{+} e^{-}$ collider has been measured to be $⟨ P ⟩ = 0.0035 \pm 0.002 4_{stat} \pm 0.002 9_{sys}$ . The systematic uncertainty studies are described in detail, which can serve as a guide for future applications of tau polarimetry. A proposed $e^{-}$ beam longitudinal polarization upgrade to the SuperKEKB $e^{+} e^{-}$ collider would benefit from this technique.
Cited by 9
Open Access
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Cited by 14
- 10 May 2012
- Published by American Physical Society (APS) in Physical Review D
Erratum: Search for $C P$ violation in the decay $τ^{-} \to π^{-} K_{s}^{0} (\geq O π^{0}) ν_{τ}$ [Phys. Rev. D 85, 031102(R) (2012)]
by J. P. Lees, V. Poireau, V. Tisserand, J. Garra Tico, E. Grauges, M. Martinelli, D. A. Milanes, A. Palano, M. Pappagallo, G. Eigen, et al.
DOI: https://doi.org/10.1103/PhysRevD.85.099904
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- 10 May 2012
- Published by American Physical Society (APS) in Physical Review D
Open Access
Erratum: Search for $C P$ violation in the decay $τ^{-} \to π^{-} K_{s}^{0} (\geq O π^{0}) ν_{τ}$ [Phys. Rev. D 85, 031102(R) (2012)]
by J. P. Lees, V. Poireau, V. Tisserand, J. Garra Tico, E. Grauges, M. Martinelli, D. A. Milanes, A. Palano, M. Pappagallo, G. Eigen, et al.
DOI: https://doi.org/10.1103/PhysRevD.85.099904
Cited by 14

D. N. Brown

Research Subjects

Research Interests

D. N. Brown has a total of 497 co-authors. Here are the top co-authors by number of shared publications:

Latest Publications

Study of χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions in ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays at BABAR

Study of χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions in ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays at BABAR

Search for baryogenesis and dark matter in B + → Λ c + + invisible decays

Search for baryogenesis and dark matter in B + → Λ c + + invisible decays

Model-independent extraction of form factors and $| V_{c b} |$ in $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ with hadronic tagging at BABAR

Model-independent extraction of form factors and $| V_{c b} |$ in $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ with hadronic tagging at BABAR

Measurement of additional radiation in the initial-state-radiation processes $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ at BABAR

Measurement of additional radiation in the initial-state-radiation processes $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ at BABAR

Precision $e^{-}$ beam polarimetry at an $e^{+} e^{-}$ $B$ factory using tau-pair events

Precision $e^{-}$ beam polarimetry at an $e^{+} e^{-}$ $B$ factory using tau-pair events

Erratum: Search for $C P$ violation in the decay $τ^{-} \to π^{-} K_{s}^{0} (\geq O π^{0}) ν_{τ}$ [Phys. Rev. D 85, 031102(R) (2012)]

Erratum: Search for $C P$ violation in the decay $τ^{-} \to π^{-} K_{s}^{0} (\geq O π^{0}) ν_{τ}$ [Phys. Rev. D 85, 031102(R) (2012)]